Pentair ULTRATEMP 70 Guía De Instalación Y Usuario página 32

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Problems or Symptoms
HIGH REFRIG Alarm: Refrigerant high
pressure switch is open.
LOW REFRIG Alarm: Refrigerant low
pressure switch is open.
ULTRATEMP Heat Pump Installation and User' s Guide
®
Possible Cause
Water circulation pump inactive.
Insufficient water flow.
External bypass open.
Bad refrigerant high pressure switch.
TXV Stuck Closed.
Other Possibilities:
Other Possibilities. Low or restricted water
flow through heater. Dirty or worn filters
or clogged lint traps. Clogged filter pump
impeller. Improper plumbing valve settings.
Suction leak allowing air into the water flow.
Low water flow when switched to spa mode.
Unit is plumbed backwards. Heat exchanger
clogged with debris. Internal bypass valve
damaged or clogged with debris.
Unit overcharged.
Compressor Thermal Protector tripped
open.
Low refrigerant in system.
Air and water temperatures too cold to
operate the heat pump.
Bad refrigerant low pressure switch.
Faulty fan.
TXV Stuck Closed.
Insufficient airflow through air coil
Corrective Action
Verify water pump is on.
Verify filter and skimmers are clean, backwash if necessary.
Minimum flow 30 GPM [113.6 LPM].
Verify external water bypass around heat pump is closed. Also
make sure all other valves are open or in the proper positions to
allow proper water flow through heat pump.
Check resistance of switch, if open, replace switch.
1. Disconnect TXV bulb from suction line (SL), have it in your
hand, if pressures go back to normal, then reinstall the bulb
on suction line (it may have some debris stuck in the port).
For adjustable TXVs open adjustable valve, it may remove the
debris and set it back to original position.
2. If (1) does not work, recover the charge, remove bulb from
SL, unscrew TXV head, shake it, if rattles, replace head (PN
KT-45-ZGA), if not, replace TXV and filter dryer and charge
appropriately.
Check Water level in pool. This condition may appear if the heat
pump has NOT been operated for an extended period. To Clear
this condition, cycle the heat pump on and off up to 3 times. If this
does not correct problem, call for service.
Clean entire filtering system and or replace filter element. Inspect
& clean pump impeller. Adjust all plumbing valves. Repair suction
air leaks, grease pump lid O-ring. Replace filter. Wrong filter
pump pipe size. Automatic pool vacuum causing restriction. Call
your dealer or factory for advice if above does not solve the
problem.
Reclaim charge. Recharge with appropriate nameplate charge.
Check Thermal Protector located on top of the compressor. The
Thermal Protector will trip if the compressor reaches a temperature
greater than 240°F (115.6°C). It will reset when the temperature
drops below 170°F (76.7°C).
If the corrective actions above do not resolve the HIGH REFRIG
Alarm, check the resistance of the Thermal Protector while the unit
is powered off, if the circuit is open, replace the Thermal Protector.
*This feature is only available on heat pumps equipped with LG
compressors starting 11/1/2020, except the UT70 model, which
uses an internal Thermal Protection device.
Find source of refrigerant leak and fix. Pull vacuum and recharge.
Wait until temperatures warm up and see if unit operates.
Check resistance of switch with a full charge, if open, replace switch.
Check the capacitor and fan motor. Replace either one if it is
faulty. Check the fan blade and make sure it is not slipping or
broken. If so, replace the fan.
1. Disconnect TXV bulb from suction line (SL), have it in your
hand, if pressures go back to normal, then reinstall the bulb
on suction line (it may have some debris stuck in the port).
For adjustable TXVs open adjustable valve, it may remove the
debris and set it back to original position.
2. If (1) does not work, recover the charge, remove bulb from
SL, unscrew TXV head, shake it, if rattles, replace head (PN
KT-45-ZGA), if not, replace TXV and filter dryer and charge
appropriately.
Remove surrounding debris or shrubs or heat pump maintenance
by qualified personnel.